Localized heat contact urticaria

Localized Heat Contact Urticaria is a rare form of urticaria or hives that occurs upon direct contact with heat. Unlike other forms of urticaria, which can be triggered by various factors such as allergens, stress, or cold, Localized Heat Contact Urticaria specifically arises due to the exposure of the skin to a warm or hot object. This condition is a type of physical urticaria, where the physical factor of heat induces the skin reaction.

Symptoms

The primary symptom of Localized Heat Contact Urticaria is the rapid onset of urticaria (hives) at the site of heat contact. These hives are typically red, raised, and itchy welts on the skin. The reaction usually occurs within minutes of heat exposure and can last for hours. Other symptoms may include a burning sensation or pain at the site of the hives. Unlike systemic reactions, symptoms are generally confined to the area of heat contact.

Causes

The exact cause of Localized Heat Contact Urticaria is not fully understood. It is believed to involve a hypersensitivity or abnormal response of the skin to heat. In some cases, it may be related to an overactive immune response, where the body mistakenly identifies heat as a harmful substance and releases histamine and other chemicals into the skin, leading to inflammation and hives.

Diagnosis

Diagnosis of Localized Heat Contact Urticaria involves a detailed medical history and physical examination. A dermatologist may perform specific tests to confirm the diagnosis, such as the heat provocation test, where a warm object is applied to the skin to observe if hives develop. Differential diagnosis is important to rule out other types of urticaria and skin conditions that may present with similar symptoms.

Treatment

Treatment of Localized Heat Contact Urticaria focuses on symptom management and avoiding heat exposure. Antihistamines are commonly prescribed to reduce itching and inflammation. In more severe cases, other medications such as corticosteroids or leukotriene receptor antagonists may be recommended. Patients are advised to avoid direct contact with heat sources and to use protective measures when exposure is unavoidable.

Prevention

Preventive measures for Localized Heat Contact Urticaria include avoiding known triggers, such as hot baths, heating pads, or direct sunlight. Wearing protective clothing and using barrier creams may also help minimize skin exposure to heat.

See Also

• Urticaria
• Physical Urticaria
• Dermatology